Tom, Melissa - you are right. I consulted with a native speaker and she told me that "can" and "one" should be switched in order for the sentence to be grammatically correct. So, instead of "What digit one can change..." it is "What digit can one change..." This is corrected now.

Thumbs up to Rachel_t and Katrina who managed to find the arithmetic progression anyway. Rachel_t gets a puzzle point for posting the answer first.

Like the last answer. Original sequence of high temperatures: 46, 58, 70, 83. Change 46 to 47, get 47, 58, 70, 83. While it is not an arithmetic progression, temperature differences do make an arithmetic progression:58-47=1170-58=1283-70=13

Brave, anonymous.Please feel free to add your name below to get a puzzle point.

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My name is Maria Lando. I am a parent, a wife, a friend, an occasional cook, a shopper, a gym member, a world traveler, a regular working mom who is trying to balance everything and enjoy life with the help of humor and mathematics.Read more ...